regex - Check currency field only contains 1 fullstop -

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Anyone can help me write a regular expression to check a string in a specific format - 300.00

In this '.' Before and after only numbers can be 'me.' Should only have one presence

so 300.00 or 300.0.0 is invalid. 

  ^ [0 -9] + \. [0-9] * $

This means that the beginning of the string ( ^ ), one or more digits ( [0- 9] + ), the optional period ( \.? ), then 0 or more digits, then the end of the string. You can modify it as necessary, e.g. To allow the string to start from the duration (first change * ) or mandate duration (remove ? ).


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